A police spokeswoman said they were called around midday about the concerning item in front of a property on Stanley Pt Rd.
It appeared the item was a piece of historic military equipment, she said.
"Our main role was to ensure the public's safety and there was no threat to the public."
The Defence Force explosive ordnance disposal team attended that incident too.
Meanwhile, an air rifle was seized in South Auckland this morning by police after reports it was discharged in public.
Two people were also arrested after a member of the public called police about the discharge of the firearm about 9.20am.